07-09-2020, 08:05 PM
When you flash uboot (and friends), it is easiest to flash whole 16M
But that will overwrite mbr (1 sector) or gpt-mbr (34 sectors)
So, the trick is to save it first, 1 sector or 34, depending on disk partition system,
and then write it back at end, a lot easier than typing a bunch of numbers,
all of which have to be right
The easiest way to get whole 16M is a mrfixit install on SD, updated
Also a good emergency recovery SD
Save all this on usb key (16M, original 16M (you may change mind), mbr, all appropriately named)
But that will overwrite mbr (1 sector) or gpt-mbr (34 sectors)
So, the trick is to save it first, 1 sector or 34, depending on disk partition system,
and then write it back at end, a lot easier than typing a bunch of numbers,
all of which have to be right
The easiest way to get whole 16M is a mrfixit install on SD, updated
Also a good emergency recovery SD
Save all this on usb key (16M, original 16M (you may change mind), mbr, all appropriately named)